chakra: Stack-use-after-return in Js::NarrowStringToWide

Detailed report: https://oss-fuzz.com/testcase?key=5668803167387648 Project: chakra Fuzzer: jsfuzzer Job Type: asanchakra Platform Id: linux Crash Type: Stack-use-after-return READ Crash Address: 0x7f9fb8b97920 Crash State: Js::NarrowStringToWide Js::WabtInterface::EntryConvertWast2Wasm...